Constipation on GLP-1: pathophysiology and evidence-based management

pete_manc_UK said:

The escalation order that reflects the mechanism: water and salt first, then soluble fiber, then magnesium or an osmotic agent, then a stimulant only…

Worth saying plainly that not all of this is benign. Severe constipation on delayed gastric emptying has produced obstruction and ileus cases, rarely but genuinely. Pain with vomiting and no bowel movement is not a fiber conversation.

Correct me if the detail matters more than I have assumed.

Dr.GutHealth said:

The mechanism is slowed transit plus reduced intake, and that combination determines which interventions work.

Gastroparesis symptoms with constipation: the delayed gastric emptying from GLP-1 agonists can cause early satiety, bloating, and feeling "full" for hours after a small meal.

Tips: eat your protein FIRST (most important macro), then vegetables, then carbs last. Chew thoroughly — 20-30 chews per bite isn't excessive. Avoid carbonated beverages with meals. If symptoms are severe, your doctor may recommend a gastric emptying study.

amsterdam_pete said:

Worth saying plainly that not all of this is benign.

Heartburn management on constipation: omeprazole 20mg has been my savior. The delayed gastric emptying means stomach acid just sits there.

Don't ignore persistent heartburn — chronic acid exposure can damage your esophagus. If OTC remedies aren't cutting it after 2 weeks, see your doctor for something stronger. You shouldn't suffer through this.

One thing that is still open after SkepticalSean’s answer:

What the mechanism is, because if it is transit rather than water then fiber is the wrong lever?

Closing the loop on my own question.

Update — the osmotic agent was the thing. I had been reaching for a stimulant, which was making the next day worse.